Aggregates from Residual Concrete

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Title: Aggregates from Residual Concrete

Author(s): Giorgio Ferrari, Alberto Brocchi, Fiorenza Cella, Maria Chiara Dalconi, and Federico Longhi

Publication: Special Publication

Volume: 289

Issue:

Appears on pages(s): 1-15

Keywords: ready-mixed plant, residual concrete, recycled aggregates, superabsorbant polymers, setting accelerators, ettringite, waste reduction

Date: 9/14/2012

Abstract:
The paper describes a new technology for recycling residual fresh concrete at the ready-mixed plant, which transforms the unset residual concrete from the construction site into granular materials, in short period of time and without production of waste. The method employs organic polymers and setting accelerators, which are added directly into the truck mixer and transform the residual concrete into aggregates which, after curing, can be reused for the production of new concrete. The new technology represents a significant contribution to the area of reduction of waste at the ready-mixed plant. It also contributes to the protection of natural resources, in accordance with the guidelines of the European Directive on wastes.